Achnatherum

Achnatherum is a genus of plants which includes several species of needlegrass. Several needlegrass species have been switched between Achnatherum and genus Stipa; taxonomy between the two closely related genera is still uncertain.

Achnatherum hymenoides was useful as a food source to Native Americans. Achnatherum brachychaetum is best known as a noxious weed.

Species
19 species recognized by Plants of the World Online as of July 2023:

Species previously included in Achnatherum:


 * Achnatherum acutum (Swallen) Valdés-Reyna & Barkworth
 * Achnatherum aridum (M.E.Jones) Barkworth - Mormon needlegrass
 * Achnatherum bloomeri (Boland.) Barkworth - Bloomer's ricegrass
 * Achnatherum bromoides (L.) P. Beauv.
 * Achnatherum brachychaetum (Godr.) Barkworth - punagrass
 * Achnatherum capense (L.) P. Beauv.
 * Achnatherum caragana (Trin. & Rupr.) Nevski
 * Achnatherum caudatum (Trin.) S. L. W. Jacobs & J. Everett - Chilean ricegrass
 * Achnatherum clandestinum (Hack.) Barkworth - Mexican ricegrass
 * Achnatherum contractum (B.L. Johnson) Barkworth - contracted ricegrass
 * Achnatherum coronatum (Thurb.) Barkworth - crested needlegrass
 * Achnatherum curvifolium (Swallen) Barkworth - Guadalupe ricegrass
 * Achnatherum diegoense (Swallen) Barkworth - San Diego needlegrass
 * Achnatherum duthiei (Hook.f.) P.C. Kuo & S.L. Lu
 * Achnatherum editorum (E. Fourn.) Valdés-Reyna & Barkworth
 * Achnatherum eminens (Cav.) Barkworth - southwestern needlegrass
 * Achnatherum hendersonii (Vasey) Barkworth - Henderson's needlegrass
 * Achnatherum hymenoides (Oryzopsis hymenoides) Ricker ex Piper - Indian ricegrass
 * Achnatherum latiglume (Swallen) Barkworth - wide-glumed needlegrass
 * Achnatherum lemmonii (Vasey) Barkworth - Lemmon's needlegrass
 * Achnatherum lettermanii (Vasey) Barkworth - Letterman's needlegrass
 * Achnatherum lobatum (Swallen) Barkworth - lobed needlegrass
 * Achnatherum nelsonii (Scribn.) Barkworth - Nelson's needlegrass, Dore's needlegrass
 * Achnatherum nevadense (B.L. Johnson) Barkworth - Nevada needlegrass
 * Achnatherum occidentale (Thurb.) Barkworth - western needlegrass
 * Achnatherum parishii (Vasey) Barkworth - Parish's needlegrass
 * Achnatherum perplexum Hoge & Barkworth - perplexing needlegrass
 * Achnatherum pinetorum (M.E. Jones) Barkworth - pinewoods needlegrass
 * Achnatherum richardsonii (Link) Barkworth - Richardson's needlegrass
 * Achnatherum robustum (Vasey) Barkworth - sleepygrass
 * Achnatherum roshevitzii Mussajev - Roshevich's achnatherum
 * Achnatherum scribneri (Vasey) Barkworth - Scribner needlegrass
 * Achnatherum speciosum Trin. & Rupr. - desert needlegrass
 * Achnatherum stillmanii (Bol.) Barkworth - Stillman's needlegrass
 * Achnatherum thurberianum (Piper) Barkworth - Thurber's needlegrass
 * Achnatherum swallenii (C.L. Hitchc. & Spellenb.) Barkworth - Swallen's needlegrass
 * Achnatherum webberi (Thurb.) Barkworth - Webber needlegrass

Formerly placed here

 * Neotrinia splendens (Trin.) M.Nobis, P.D.Gudkova & A.Nowak (as A. splendens Trin. Nevsky )